Interlocking mechanism for cold-saw cutting-off machines.



M. MEYERS. INTERLOOKING MECHANISM FOR com) SAW CUTTING-OFF MACHINES. APPLICATION FILED MAR. 13, 1913.

1,081,763. Patented Dec. 16, 1913.

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1,081,763. Patented Dec. 16, 1913.

3 SHEETS-SHEET 2.

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1,081,763. Patented Dec. 16, 1913.

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UNITED STATEb PATEN T OFFTCE.

MAX MEYERS, 0F PHILADELPHIA, PENNSYLVANIA, ASSIGNOR T0 NEWTON MACHINE TOOL WORKS, INCORPORATED, 013 PHILADELPHIA, PENNSYLVANIA, A CORPORA- TION OF PENNSYLVANIA.

INTHRLOGKING MECHANISM FOR COLD-SAW CUTTING-OFF MACHINES.

Specification of Letters Patent.

Patented Dec. 16, 1913.

Application filed March 13, 1913. Serial No. 754,017.

To all whom it may concern Be it known that I, MAX MEYERB, a citizen of the United States, residing in Philadelphia, Pennsylvania, have invented certain Improvements in Interlocking Mechanism for Cold-Saw Cutting-Off Machines, of Which the following is a specification.

My inventionrelates to certain improvements in cold saw cutting off machines in .which there is a slow forward feed; a quick return feed; and a quick forward feed. This mechanism requires two operating levers.

The object of the invention is to prevent the movement of one operating lever from the normal position when the other lever is away from the normal position. This is accomplished by the use of interlocking; mechanism which will be fully described hereinafter, reference being had to the ac companying drawings, in which Figure 1, is a perspective view of a cold saw cutting off machine, showing the type of machine to which my invention is applied; Fig. 2, is a plan view of the clamping table portion of the machine shown in Fig. 1; Fig. 2 is a plan view of that portion of the machine which controls the movement of the carriage on which the cut ting ofi' saw is mounted; Fig. 3, is an enlarged sectional view illustrating two hand levers and the interlocking mechanism therefor; Fig. 4c, is a plan view of the mechanism illustrated in Fig. 3; Fig. 5, is a sectional plan view on the line aa, Fig. 3; Fig. (5, is a sectional plan view on the line b t, Fig. 3; and Fig. 7, is a view of a modification of the locking pin.

Referring to the drawings, 1 is the base having guideways 2 for a carriage 3, on which is mounted the spindle -1- carrying the saw. At the rear end. of the base 1, in the present instance, is the housing 5 inclosing the driving mechanism which controls the movement of the carriage At the opposite end of the frame 1 is an extension 6 arranged at right angles, as shown in Fig. 1, and in this extension are the slots 7 to which the usual. screw clamps are secured.

All of the above described mechanism is common in this type of machine.

It is desirable to control the carriage by the mechanism contained in the housin 5,

so that the carriage can be moved rapidly forward to adjust it to the work, and then moved slowly forward during the cutting operation. After the bar, or other article, is severed, the mechanism is reversed so as to quickly return the carriage. Great care must be exercised in the manipulation of the lovers under ordinary conditions so that one set of mechanism will be thrown entirely out of gear before the other is thrown in gear, and the object of the present invention, as stated above, is to so construct the mecha nism that it will be impossible to move one lever while the other is in position.

8 is a feed screw which is coupled to or forms part of the shaft 9, Fig. 2 On this sha ft 9 is a clutch sleeve 10 which is moved by a lever 11 through a rod 12 extending, through the shaft 9 which is made hollow for a short distance. The lever 11 is mount ed on a rock shaft 13 to which is attached a lever 14. A red 15 is connected to the lever 14 and extends throughout the length of the machine and through the extension 6; being connected to the arm 16, Fig. 3, which is secured to a shaft 17 on which is the operating lever 18, so that upon moving said lever 18 the clutch sleeve 10 will either be thrown into mesh with the hub 19 or with the hub 20, both of which are loose on the shaft 9. Secured to the hub 19 is a beveled gear wheel 21 and secured to the hub 20 is a beveled gear wheel 22. Both of these wheels mesh with a driving pinion 23 on a shaft 24 having at its opposite end a beveled wheel 25, which, in turn, meshes with a beveled wheel 26 on a power driven shaft- 27 on which is a belt wheel 28.

In the present instance, 20 is the forward feed driving hub, while 19 is the return feed driving hub. On the shaft Q-t is a gear wheel 22) which meshes with a gear wheel 30 on a shaft 31. On this shaft 31 is a pinion 32, which meshes with a wheel 33 on a stud, and on the hub of this wheel is a pinion 34 which meshes with a gear wheel on a shaft 36.

I have shown two sets of gears for changing the speed. These gears may be shifted in any manner desired. This particular construction forms no part of the present invention, therefore, I have omitted details.

On the shaft 36 is a worm 37 which meshes with a Worm wheel 38 loosely mounted on the shaft 9, and on this worm wheel 45 is secured an operating lever 46, located directly below the operating lever 18. The

shaft'45' is mounted in a bearing 47 on a bracket 48 secured to the side of the extension 60f the base, and the shaft 17 extends through this hollow shaft; the lower end of which is adapted to a bearing 49 in said bracket 48, as illustrated in Fig. 3.

The worm 37 and theworm wheel 38,

when the clutch sleeve is moved into engagement with the worm wheel, slowly turn the screw 8 so as toslowly feed the carriage forward.

It will be seen that the clutch sleeve 10 must be in the mid-position when the clutch 4.0 is in engagement with its wheel 38 and must not be moved into engagement with either of the hubs 19 or 20; otherwise some portion of the mechanism would break, owing to the conflict of movement.

My invention relates particularly to interlocking mechanism, which will prevent the movement of one operating lever shifting the mechanism which would cause the screw to turn while the screw is being driven by the mechanism controlled by the other operating lever. One lever must be brought to a position to throw the screw out of gear with its mechanism before the other level.

can be moved to throw its mechanism ingear with the said screw.. This is accomplished' by the construction illustrated in Figs. 3 to 6, both inclusive. Mounted between the two levers 46 and 18 is a stop plate 50, which is fixed to the bracket 48, in

the present instance by bolts 51, Fig. 5.

This stop plate is, in the form of a segment and has a vertical opening for the reception of a pin52' which is round at both ends, as illustrated in Fig' 3. In the lever 18 is a notch 53 for the reception of one end of the pin and'in the lever 46 is a n0tch'54 for the reception of the other end of the pin.

It will be seen that, when the levers are in the mid-position, as illustrated in Fig. 3, so that the screw is entirely disconnected from the power mechanism, the pin 52 is free to move into either of the notches 53 or 54. Should the lever 46, however, be moved to actuate the slow forward feed clutch sleeve 40, then the notch 54 will be moved out of line with the pin 52; the plain surface of the lever 46 holding the pin positively in the notch 53 of the lever 18 memes tion with the notch 54 directly under the pin 52. If the lever 18 is moved either to the right or to the left to throw the clutch sleeve 10 into engagement with either the hub 19 or with the hub 20 to turn the screw 8 so as to move the carriage quickly forward or to return it rapidly, then the pin 52 is forced into the notch 54 and is held therein by the surface of the lever 18, so that it will be impossible to move the lever 46 until the lever 18 is brought to its normal position.

The quick movement lever 18 can be moved, as above described, toshift the mechanism which will turn the screw forward or reverse it, and, in order'to prevent the operator accidentally moving it in the wrong-direction, I notch the segment at 55 and mount a bolt 56 in a projection 57 on the underside of the lever 18 and provide said bolt with a handhold 58 and a spring 59, so that while the lever 18 is free to be moved in the direction of the arrow, Fig. 5, without operating the bolt 56, the bolt must be withdrawn to allow the lever to be turned in the opposite direction, as it must clear the shoulder 55 on the segmental stop plate 50. In some instances, this boltmay be omitted, but I prefer to use it in order to avoid carelessly throwing the lever'in the wrong direction.

In operating the machine, the work is clamped on the extension 6 and the quick movement of the lever 18 will connect the clutch sleeve 10 so that it will engage the hub 20 in order to turn the screw in the direction which will cause the carriage 3 to move rapidly forward toward the work. When the edge of the saw is at the work, this lever 18 is brought to the mid-position again. During the time that this lever was moved from the mid-position, it was impossible to move the lever 46 as it was locked by the pin 52. When the lever 18 is in the mid-position, the lever 46 is moved so as to throw the clutch 40 into mesh with the teeth on the worm wheel 38. This causes the screw to turn slowly and also causes the saw to move slowly into the work in order to make the desired out. After the out has been made the lever 46 is returned to its normal position and the lever 18 is moved in the direction'the reverse of that in which it was originally moved, causing the pin 52 to lock the lever 46 and the clutch sleeve 10 will engage the hub 19, causing the reverse movement of the feed screw 8, and this movement compels the carriage to return rapidly to its first position. If the bolt 56 is used, this must be withdrawn before the lever 18 can be reversed. Thus it will be seen that it is im, possible to throw the slow speed gear into action when the clutch 10 is in engagement and said lever cannot be moved until the A lever'46 is brought back to its normal posi with either of the hubs 19 or 20, and it is also impossible to move the clutch 10 when the clutch 40 of the slow speed gear is in engagement with the worm wheel 38.

In the present instance, I have shown handled. extensions on'the levers 14 and 46, so that these levers can be moved from a point near the housing instead of at the extension. I prefer to locate the interlocking mechanism at the extension and the operator must stand at a convenient point so that he can examine the work as it 1s being cut.

In place of the solid pin shown in Fig. 3, a two-part pin may be used, as in Fig. 7, and a spring placed between the two parts, so proportioned that it can be compressed to a certain limit, which will allow one lever to be moved when the other lever is in the normal position, but will prevent the movement when the lever is out of position; or each art may have a stop projection, as in Fig. to limit the independent movement of the sections.

I claim 1. The combination of a screw shaft; two hubs driven in different directions; a clutch sleeve arranged to turn with the shaft; means for throwing the clutch sleeve into contact with either hub to drive the screw at a high speed in either direction; a slow speed wheel also mounted on the screw; a clutch sleeve arranged to turn with the shaft; means for throwing the clutch sleeve into contact with the said wheel to drive the screw forward at a slow speed; two levers, one connected to the first mentioned clutch sleeve and the other connected to the last mentioned clutch sleeve; and interlocking mechanism between the two levers, whereby, when one lever is moved out of normal position, the other lever is locked in said normal position.

2. The combination in a cold saw cutting ofi machine, of a bed; a slide thereon carrying the saw; a screw for actuating the .slide; a shaft for driving the screw; two

hubs loosely mounted on the shaft; means for rotating said hubs in opposite directions; a clutch sleeve mounted to turn with the shaft; means for shifting said clutch sleeve into engagement with either of the hubs, whereby the carriage can be fed forward or reversed rapidly; a wheel'loose on the shaft; means for slowly rotating said wheel; a clutch sleeve on the shaft and arranged to turn therewith; means for throwing the clutch sleeve into engagement with the slow rotating wheel; two hand levers for actuating the said clutch mechanism; interlocking means arranged to engage said levers so that when one lever is moved from its normal position the interlocking means will lock the other lever in position; and a bolt arranged to prevent the movement of, the lever which actuatesthe first mentioned clutch, so that, while the lever can be moved in one direction, the bolt must be withdrawn to allow the lever to move in the opposite direction.

3. The combination in interlocking mechanism, of a bearing; a shaft mounted in the bearing; a hollow shaft through which the first mentioned shaft extends, each of said shafts having an arm at one end; independent clutch mechanism connected to each arm; a lever on the opposite end of each farm; a segmental stop plate mounted in the bearing and located between the two levers, said stop plate having an opening therein parallel with the shaft; each lever being notched, the notches alining with theopening when both of said levers are in the normal position; a pin mounted in the opening and of such a length that when one lever is moved out of its normal position, the pin will be held in the notch of the other lever, preventing the movement of said lever until the first mentioned lever is returned to its normal position; a spring latch carried by one of said levers, the segmental plate being notched to form an abutment for the latch, so that the lever carrying the latch will be allowed to move in one direction, but will be prevented from moving in the opposite direction until the latch is withdrawn.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing witnesses.

MAX MEYERS.

Witnesses:

WM. E. SHUPE, WM. A. BARR. 

